package com.atzhiguo.springcloud.controller;

import com.atzhiguo.springcloud.entities.CommonResult;
import com.atzhiguo.springcloud.entities.Payment;
import com.atzhiguo.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @author zhiguo
 * @version v1.0
 * @create 2020/10/14 12:19
 */
@RestController
@Slf4j
public class OrderController {

    //public static final String PAYMENT_URL = "http://localhost:8001";
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    @Resource
    private LoadBalancer loadBalanced;

    @Resource
    private DiscoveryClient discoveryClient;

    /**
     * 消费者 调用 支付服务
     * 相当于 客户端调用 服务端
     * @param payment
     * @return
     */
    @GetMapping(value = "/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        return restTemplate.postForObject(PAYMENT_URL + "/payment/create",payment,CommonResult.class);
    }


    @GetMapping(value = "/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id")Long id){
        return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id,CommonResult.class);
    }

    /**
     * getForEntity
     * @param id
     * @return
     */
    @GetMapping(value = "/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id")Long id){
        //return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id,CommonResult.class);
        ResponseEntity<CommonResult> forEntity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
        if (forEntity.getStatusCode().is2xxSuccessful()){
            return forEntity.getBody();
        }else {
            return new CommonResult<>(500,"操作失败");
        }
    }

    /**
     * 自己写的负载均衡 算法 loadBalanced
     * @return
     */
    @GetMapping(value = "/consumer/payment/lb")
    public String getPaymentLB(){
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if (instances == null || instances.size() <= 0){
            return null;
        }
        ServiceInstance serviceInstance = loadBalanced.INSTANCE(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri + "/payment/lb",String.class);
    }

    // ********************》 zipkin + sleuth
    @GetMapping(value = "/consumer/payment/zipkin")
    public String paymentZiplin(){
        String result = restTemplate.getForObject("http://localhost:8001" + "/payment/zipkin/", String.class);
        return result;
    }
}
